<!--  -->
<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert title="添加商品的信息" type="info" center show-icon :closable="false"></el-alert>

      <!-- 步骤条 -->
      <el-steps :space="200" :active="adticeIndex - 0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!-- tab栏区域 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
        label-position="top"
      >
        <el-tabs
          v-model="adticeIndex"
          :tab-position="'left'"
          :before-leave="beforeTabLeave"
          @tab-click="tabClicked"
        >
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <!-- 选择商品分类的级联选择框 -->
              <el-cascader
                v-model="addForm.goods_cat"
                :options="cateList"
                :props="cateProps"
                @change="handleChange"
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表达的Item项 -->
            <el-form-item :label="item.attr_name" v-for="item in manyTableDate" :key="item.attr_id">
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableDate" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- action 表示图片要上传到的后台API地址 -->
            <el-upload
              :action="uploadURL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              :on-success="handleSuccess"
              list-type="picture"
              :headers="headersObj"
            >
              <el-button size="small" type="primary">点击上传</el-button>
              <!-- <div slot="tip">只能上传jpg/png文件，且不超过500kb</div> -->
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器组件 -->
            <quill-editor v-model="addForm.goods_introduce" />
            <!-- 添加商品的按钮 -->
            <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>

    <!-- 图片预览对话框 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
      <img :src="previewPath" alt class="previewImg" />
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash';

export default {
  data() {
    return {
      adticeIndex: '0',
      // 添加商品的表单数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类数组
        goods_cat: [],
        // 图片的数组
        pics: [],
        // 商品的详情描述
        goods_introduce: '',
        attrs: []
      },
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' }
        ],
        goods_cat: [
          { required: true, message: '请选择商品分类', trigger: 'blur' }
        ]
      },
      // 商品分类数据列表
      cateList: [],
      //   级联选择框的配置对象
      cateProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 动态参数列表数据
      manyTableDate: [],
      // 静态属性列表数据
      onlyTableDate: [],
      // 上传图片的URL地址
      uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      // 图片上传组件的 headers 请求头对象
      headersObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      previewPath: '',
      previewVisible: false
    };
  },
  created() {
    this.getCateList();
  },
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2];
      }
      return null;
    }
  },
  methods: {
    // 获取所有商品的分类数据
    getCateList() {
      this.$http.get('categories').then(res => {
        const data = res.data;
        if (data.meta.status !== 200) {
          return this.$message.error('获取商品分类失败！');
        }

        this.cateList = data.data;
        // console.log(this.cateList);
      });
    },
    // 级联选择器选择项变化，会触发这个函数
    handleChange() {
      // console.log(this.addForm.goods_cat);
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = [];
      }
    },
    beforeTabLeave(activeName, oldActiveName) {
      // console.log(activeName, oldActiveName);
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类!');
        return false;
      }
    },
    tabClicked() {
      // 证明访问的是动态参数面板
      if (this.adticeIndex === '1') {
        this.$http
          .get(`categories/${this.cateId}/attributes`, {
            params: { sel: 'many' }
          })
          .then(res => {
            const data = res.data;
            if (data.meta.status !== 200) {
              return this.$message.error('获取动态参数列表失败！');
            }

            data.data.forEach(item => {
              item.attr_vals =
                item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ');
            });
            this.manyTableDate = data.data;
          });
      }
      if (this.adticeIndex === '2') {
        this.$http
          .get(`categories/${this.cateId}/attributes`, {
            params: { sel: 'only' }
          })
          .then(res => {
            const data = res.data;
            if (data.meta.status !== 200) {
              return this.$message.error('获取静态属性列表失败！');
            }

            this.onlyTableDate = data.data;
          });
      }
    },
    // 处理图片预览效果
    handlePreview(file) {
      this.previewPath = file.response.data.url;
      this.previewVisible = true;
    },
    // 处理移除图片的操作
    handleRemove(file) {
      // 1.获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path;
      // 2.从 pics 数组中，找到这个图片对应的索引值
      const i = this.addForm.pics.findIndex(x => x.pic === filePath);
      // 3.调用数组的 splice 方法，把图片信息对象从 pics 数组中移除
      this.addForm.pics.splice(i, 1);
      // console.log(this.addForm.pics);
    },
    // 监听图片上传成功的事件
    handleSuccess(response) {
      // 1.拼接得到一个图片信息对象
      const picInfo = response.data.tmp_path;
      // 2.将图片信息对象 push 到 pics数组上
      this.addForm.pics.push(picInfo);
    },
    // 添加商品
    add() {
      this.$refs.addFormRef.validate(valid => {
        if (!valid) {
          return this.$message.error('请填写必要的表单项!');
        }

        // 执行添加的业务逻辑 两种方法都可以
        // lodash cloneDeep(obj) 深拷贝一份 addForm
        // const form = JSON.parse(JSON.stringify(this.addForm));
        const form = _.cloneDeep(this.addForm);
        form.goods_cat = form.goods_cat.join(',');
        // 处理动态参数
        this.manyTableDate.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          };
          this.addForm.attrs.push(newInfo);
        });
        // 处理静态属性
        this.onlyTableDate.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          };
          this.addForm.attrs.push(newInfo);
        });
        form.attrs = this.addForm.attrs;
        // console.log(form);

        // 发起请求添加商品
        // 商品的名称，必须是唯一的
        this.$http.post('goods', form).then(res => {
          const data = res.data;
          if (data.meta.status !== 201) {
            return this.$message.error('添加商品失败！');
          }

          this.$message.success('添加商品成功！');
          this.$router.push('/goods');
        });
      });
    }
  }
};
</script>

<style lang='less' scoped>
.el-checkbox {
  margin: 0 10px 0 0 !important;
}

.previewImg {
  width: 100%;
}

.btnAdd {
  margin-top: 15px;
}
</style>
